//
//  ObjcRuntime.m
//  CSMBP
//
//  Created by 杨辉 on 14-1-20.
//  Copyright (c) 2014年 Forever OpenSource Software Inc. All rights reserved.
//

#import "ObjcRuntime.h"


NSDictionary *GetPropertyListOfObject(NSObject *object){
  return GetPropertyListOfClass([object class]);
}

NSDictionary *GetPropertyListOfClass(Class cls){
  NSMutableDictionary *dict = [NSMutableDictionary dictionary];
  
  unsigned int outCount, i;
  objc_property_t *properties = class_copyPropertyList(cls, &outCount);
  for(i = 0; i < outCount; i++) {
    objc_property_t property = properties[i];
    const char *propName = property_getName(property);
    const char *propType = property_getAttributes(property);
    if(propType&&propName) {
      NSArray *anAttribute = [[NSString stringWithUTF8String:propType]componentsSeparatedByString:@","];
      NSString *aType = anAttribute[0];
      //暂时不能去掉前缀T@\"和后缀"，需要用以区分标量与否
      //            if ([aType hasPrefix:@"T@\""]) {
      //                aType = [aType substringWithRange:NSMakeRange(3, [aType length]-4)];
      //            }else{
      //                aType = [aType substringFromIndex:1];
      //            }
      [dict setObject:aType forKey:[NSString stringWithUTF8String:propName]];
    }
  }
  free(properties);
  
  return dict;
}

//静态就交换静态，实例方法就交换实例方法
void Swizzle(Class c, SEL origSEL, SEL newSEL)
{ 
  Method origMethod = class_getInstanceMethod(c, origSEL);
  Method newMethod = nil;
  if (!origMethod) {
    origMethod = class_getClassMethod(c, origSEL);
    if (!origMethod) {
      return;
    }
    newMethod = class_getClassMethod(c, newSEL);
    if (!newMethod) {
      return;
    }
  }else{
    newMethod = class_getInstanceMethod(c, newSEL);
    if (!newMethod) {
      return;
    }
  }
  
    IMP newIMP =  method_getImplementation(newMethod);
    const char *newType = method_getTypeEncoding(newMethod);
    
  //自身已经有了就添加不成功，直接交换即可
  if(class_addMethod(c, origSEL, newIMP, newType)){
    class_replaceMethod(c, newSEL, method_getImplementation(origMethod), method_getTypeEncoding(origMethod));
  }else{
    method_exchangeImplementations(origMethod, newMethod);
  }
}









